Pyrrolidine → 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-1-(pyrrolidin-1-yl)ethanone

HRID 1775549Notes

Reaction equation

HRID 1775549 reaction equation
[Cl:1][C:2]1[C:7]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)=[N:6][N:5]=[C:4]2[N:14]([CH2:23][C:24]([OH:26])=O)[N:15]=[C:16]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[C:3]=12.[NH:27]1[CH2:31][CH2:30][CH2:29][CH2:28]1.C(N(C(C)C)CC)(C)C.F[P-](F)(F)(F)(F)F.N1(OC(N(C)C)=[N+](C)C)C2N=CC=CC=2N=N1>C(Cl)Cl>[Cl:1][C:2]1[C:7]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)=[N:6][N:5]=[C:4]2[N:14]([CH2:23][C:24]([N:27]3[CH2:31][CH2:30][CH2:29][CH2:28]3)=[O:26])[N:15]=[C:16]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[C:3]=12

Participants

6

Reactant 4

HCID 31268PyrrolidineHCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 665757822-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetic acid

Product 1

HCID 665757812-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-1-(pyrrolidin-1-yl)ethanoneYield 28.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a suspension of 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetic acid (510 mg, 1.4 mmol) in CH2Cl2 (9 mL) were added pyrrolidine (174 μL, 2.1 mmol), diisopropylethylamine (DIPEA) (366 μL, 2.1 mmol) and 2-(7-Aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) (798 mg, 2.1 mmol). The solution obtained was stirred at room temperature for 90 min then diluted with CH2Cl2. The organic phase was washed with aqueous NaHCO3, passed over a phase separator and concentrated in vacuo. The resultant residue was purified using chromatography (silica gel, gradient 0 to 70% ethyl acetate/isohexane) followed by a second chromatography purification (silica gel, gradient 0 to 25% dichloromethane/ether) yielding Compound 45 as a solid (165 mg).

Workup

  1. customThe solution obtained
  2. washThe organic phase was washed with aqueous NaHCO3
  3. concentrationconcentrated in vacuo
  4. customThe resultant residue was purified
  5. customfollowed by a second chromatography purification (silica gel, gradient 0 to 25% dichloromethane/ether)

Sources & evidence

ORD record
ord-d228103f0ce4433c8a48fcad89cf4f7a
Source dataset
uspto-grants-2016_02
Patent number
US09260381B2

Reaction notes

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